Casting plug



FIG. 1 is a perspective view of a top and left side view of the casting plug showing our new design;

FIG. 2 is a top elevation view thereof;

FIG. 3 is a bottom elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof. 

The ornamental design of a casting plug, as shown and described. 